DeepSeek Harness (dsh) - Everything Functions as a Plugin

DeepSeek Harness (dsh) is an open-source framework designed for building agent harnesses, enabling developers to create customizable and extensible AI agents. Built on the Cordis kernel, it allows for a modular approach where every capability, including models, tools, and sessions, can be treated as replaceable plugins. This flexibility is aimed at teams looking to develop their own agent runtimes without relying on closed systems.

1. Plugin Architecture

   DeepSeek Harness operates on a plugin architecture, allowing users to add or remove capabilities without altering the core system. This design promotes flexibility and customization.

2. Multiple Runtime Modes

   The framework offers four distinct modes: Standard, Code, Minimal, and Creator, each catering to different use cases, from full coding agents to minimal environments for benchmarking.

3. Append-Only Session Log

   Every interaction within the harness is recorded in an append-only session log, ensuring that all model-visible actions are traceable and can be resumed or replayed.

4. Community Plugin Ecosystem

   A growing ecosystem of community plugins is available, allowing users to extend the functionality of DeepSeek Harness with additional tools and capabilities.

5. Local Web UI

   Users can access a local web interface at http://127.0.0.1:3080, which simplifies interaction with the harness and provides a user-friendly way to manage sessions and plugins.

6. Developer Preview

   Currently in developer preview, DeepSeek Harness is open for feedback and is expected to evolve rapidly, with compatibility-breaking changes anticipated.

1. Ensure you have Node.js 22.19+ or 24+ installed before running the harness.
2. Use the command npx @deepseek-ai/dsh web to start the local Web UI.
3. Select a workspace directory in the settings to enable session management.
4. Explore the plugin ecosystem to find community plugins that can enhance your agent's capabilities.

What is DeepSeek Harness?

DeepSeek Harness is a framework for building customizable AI agent harnesses, allowing developers to create and manage agents using a modular plugin architecture.

How does DeepSeek Harness work?

It operates by allowing users to configure various plugins that provide different capabilities, such as models and tools, while maintaining a session log for tracking interactions.

Can I use DeepSeek Harness for production?

Currently, it is in developer preview and not recommended for production use due to potential compatibility-breaking changes.

What are the runtime modes available?

DeepSeek Harness offers four modes: Standard, Code, Minimal, and Creator, each designed for specific use cases and levels of complexity.

Price data is not available yet; please visit the official website for more information.

1. Strengths: DeepSeek Harness provides a highly flexible and modular framework that allows for extensive customization through its plugin architecture. The append-only session log is a significant advantage for tracking and debugging agent interactions.

2. Areas for Improvement: As it is still in developer preview, users may encounter instability and frequent changes in core plugins and APIs. Additionally, the lack of production readiness may deter teams looking for a stable solution.

3. User Experience: The local web UI is a strong feature, but the inability to serve it across a network limits accessibility for collaborative work.

4. Community Support: The growing ecosystem of community plugins is promising, but users should exercise caution as these plugins are not officially audited for security.